Collection System Management with Multitasking and High Capacity Lift Station

In order to accommodate increasing flows from growing industrial customers, the City of Chandler, Arizona, had to rethink and make major modifications to the current wastewater collection and treatment system in the southwestern part of the City. The nearest treatment facility was already at capacity and did not have the ability to treat greater amount of industrial flows. The existing lift station was already relieving the plant by conveying flows to another facility and was at capacity and lacked the ability to regulate how industrial and domestic flows were distributed between the two plants. The design approach and highly flexible operational features of a new 76,000 m3/d (20 mgd) lift station capable of managing the distribution of domestic and industrial sewer flows between two treatment facilities, located eight kilometers (five miles) away from each other, are reviewed in this paper.